中国地球物理学会年刊最新文献

Contour extraction of fetus' head from echocardiogram using Snakes 蛇形超声心动图胎儿头部轮廓提取

中国地球物理学会年刊 Pub Date : 2003-04-01 DOI: 10.1109/IEMBS.2002.1106281

Toshiyuki Tanaka, M. Torikai

{"title":"Contour extraction of fetus' head from echocardiogram using Snakes","authors":"Toshiyuki Tanaka, M. Torikai","doi":"10.1109/IEMBS.2002.1106281","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1106281","url":null,"abstract":"Summary form only given. We extract a contour of the fetus head from an echocardiogram BPD (biparietal diameter) level at 15-25 pregnancy weeks, without being influenced by the lack of pixels and noise elements, for the diagnostic support of the doctor. As for the contour of the fetus head, it is effective for diagnosis of the pregnancy week and degree of deformity before birth. Various evaluation values were automatically calculated as features from the obtained contour. This research consists of preprocessing, contour extraction, and calculation of the evaluation value. First, as the preprocessing, the noise is reduced from the original image and an indistinct point has been improved by using the contrast emphasis and median filtering. Next, the contour of the fetus head was extracted by using the active contour model Snakes, more highly accurate than a general technique. Finally the OFD (occipitofrontal diameter), BPD, were automatically computed from the obtained contour. The improvement of the extraction accuracy was confirmed by setting the best energy parameters for Snakes in contour extraction. We succeeded in obtaining evaluation values with the same accuracy, compared with those calculated from the contour depicted by the doctor.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89819083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Methodology for estimating instantaneous heat removal from human skin in response to cryogen spray cooling 估计人体皮肤对冷冻剂喷雾冷却反应的瞬时散热的方法学

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1053279

B. Pikkula, J. Tunnell, B. Anvari

引用次数: 0

New method in acoustic analysis for the diagnosis of the laryngeal functions 声学分析诊断喉功能的新方法

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1134423

J. Choi, Myung-Whun Sung, K. Park

引用次数: 4

Study of polarization evolution in phantom tissues with ultrafast optics techniques: Monte Carlo simulations and experiments 用超快光学技术研究幻影组织的偏振演化:蒙特卡罗模拟与实验

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1053303

Xueding Wang, L.V. Wang, Chia-Wei Sun, Hsiang-Shi Wang, C.C. Yang, Y. Kiang

{"title":"Study of polarization evolution in phantom tissues with ultrafast optics techniques: Monte Carlo simulations and experiments","authors":"Xueding Wang, L.V. Wang, Chia-Wei Sun, Hsiang-Shi Wang, C.C. Yang, Y. Kiang","doi":"10.1109/IEMBS.2002.1053303","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1053303","url":null,"abstract":"This paper presents our study results of polarized short pulse transmission through phantom tissues made of polystyrene particle solutions with various concentrations and particle sizes. To improve the quality of optical imaging using an ultrafast light source, study is required to fully understand the evolution of the polarization state in the sample, as well as the time- and polarization-dependent distributions of optical intensity exiting from samples. Temporal profiles of the Stokes vectors and the degree of polarization are measured experimentally. The results agree well with those resulting from Monte Carlo simulations. Analyses based on the Stokes-Mueller formalism show that the first scattering event determines the spatial patterns of the transmitted Stokes vectors. When a detected area at the output surface of the sample is symmetric about the incident beam, the temporal profile of transmittance is independent of the incident polarization state. The linear relationship between the average order of scatters and the light propagation time can be used to explain the exponential decay of the degree of polarization and the inversely proportional relationship between the FWHM of the degree of polarization and the scatterer concentration.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81502740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phage display of adenoviral HI loop for "context-specific" ligand selection 腺病毒HI环的噬菌体展示，用于“上下文特异性”配体选择

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1136947

D. Ghosh, M. Barry

引用次数: 0

The VaNTH Bioengineering Curriculum Project 凡特理工学院生物工程课程设计

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1053470

R. Linsenmeier, T. R. Harris, S. Olds

引用次数: 18

Effects of vessel curvature on intracranial aneurysmal flow 血管曲率对颅内动脉瘤血流的影响

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1106416

Y. Hoi, H. Meng, B. Bendok, L. Guterman, L. Hopkins

引用次数: 0

Gait training in individuals with incomplete SCI: how are they different from healthy subjects? 不完全性脊髓损伤患者的步态训练:与健康人有何不同?

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1053352

E. Delikanaki-Skaribas, H. Lim, H. Qureshy, S. Holmes, E. Protas, A. Sherwood

{"title":"Gait training in individuals with incomplete SCI: how are they different from healthy subjects?","authors":"E. Delikanaki-Skaribas, H. Lim, H. Qureshy, S. Holmes, E. Protas, A. Sherwood","doi":"10.1109/IEMBS.2002.1053352","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1053352","url":null,"abstract":"The purpose of this study was to examine the effects of 3-month gait training on mean gait oxygen consumption (VO2), gait speed (GS), distance covered in a 5-minutes walk, and gait cost (GC). In order to better explain the results, the data were compared to healthy subjects. Ten incomplete SCI patients with mean age 40/spl plusmn/14 years participated to the study. The results showed significant increases in mean walking VO2 (p<0.01), GS (p<0.01), and distance covered (p<0.01) during the 5-minute walking test. While GC did not improve significantly after training, there was a definite trend of lower VO2 consumption per meter walked. The relation between VO2 and GS was compared to data of a 5-minute walking test of healthy individuals. There was a significant positive correlation between VO2 and GS in healthy (r=0.68; p<0.01) and there was no correlation (r=0.10) between those variables in SCI individuals. There was no correlation between GC and GS in healthy (r=0.128) and there was a significant negative correlation in SCI individuals. There is evidence that SCI individuals benefit from gait training. While physiological responses during walking are different in individuals with SCI than healthy, gait training reduces that difference.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86105902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Integrated modeling of yeast kinetochore microtubule dynamics and the imaging thereof by fluorescence microscopy 酵母着丝点微管动力学的综合建模及其荧光显微镜成像

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1136969

B. Sprague, C. Pearson, P. Maddox, E. Salmon, D. Odde

{"title":"Integrated modeling of yeast kinetochore microtubule dynamics and the imaging thereof by fluorescence microscopy","authors":"B. Sprague, C. Pearson, P. Maddox, E. Salmon, D. Odde","doi":"10.1109/IEMBS.2002.1136969","DOIUrl":"https://doi.org/10.1109/IEMBS.2002.1136969","url":null,"abstract":"We were interested in determining the mechanisms by which microtubules mediate the segregation of chromosomes during mitosis in S. cerevisiae. In metaphase each chromosome has a single kinetochore assembled on its kinetochore region and each yeast kinetochore is in turn associated with a single microtubule plus end. A yeast strain containing a GFP fusion to the kinetochore protein, Cse4p, was used to track kinetochore microtubule dynamics by fluorescence microscopy. However, the images were blurry as a result of diffraction, and so rather than deconvolve the experimental images, we instead convolved the model predictions with a model of the image formation process to generate simulated microscopic images. Using the latter approach, which we call \"model-convolution,\" it was impossible to mistakenly converge to a false reconstructed image, as can happen with the former approach, and it was computationally faster. The simulated images were compared statistically to the experimental images to determine that a simple dynamic instability model was unacceptable. However, a stable spatial gradient of microtubule catastrophe rate model provided reasonable agreement. These results show that the behaviors of proteins confined to subcellular compartments can be quantitatively analyzed, provided that both the intrinsic dynamics and the imaging of those dynamics are modeled.","PeriodicalId":60385,"journal":{"name":"中国地球物理学会年刊","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2002-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82736829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparison and analysis of electrical impedance tomographic images reconstructed using two algorithms 两种算法重建的电阻抗层析图像的比较与分析

中国地球物理学会年刊 Pub Date : 2002-12-01 DOI: 10.1109/IEMBS.2002.1106218

J. Zhang, R. Patterson, A. Korjenevsky

引用次数: 3